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열 화학적 환원 처리를 이용한 절연체 12CaO·7Al<sub>2</sub>O<sub>3</sub>의 전도체로의 전환
정준호,은종원,오동근,김광진,홍태의,정성민,최봉근,심광보,Chung, Jun-Ho,Eun, Jong-Won,Oh, Dong-Keun,Kim, Kwang-Jin,Hong, Tae-Ui,Jeong, Seong-Min,Choe, Bong-Geun,Shim, Kwang-Bo 한국결정성장학회 2010 한국결정성장학회지 Vol.20 No.4
마이크로 웨이브 연소합성법(microwave-assistant combustion method)를 이용하여 $12CaO{\cdot}7Al_2O_3$(C12A7) 분말을 성공적으로 제작하였고, $H_2$ 가스 분위기에서의 후열처리를 통하여 C12A7:H 제작에 성공하였다. 분말의 합성 여부 와 결정성 확인 및 분말 하소 시 온도에 따른 반응 분석을 위하여 X-ray diffraction(XRD) 및 TG-DSC 분석을 시행하였다. 또한, 후 열처리 후 C12A7 cage 내부의 자유산소 이온이 수소 이온으로 치환되었는지 확인하기 위하여 TG-MS 분석을 시행하였고, $289.5^{\circ}C$에서 H와 $H_2$ 가스가 방출되는 것이 확인되었으므로, H 이온이 cage 내부로 치환된 것을 확인시켜준다. 성공적으로 치환된 C12A7:H 를 홀 측정기(Hall measurement)를 이용하여 전도성을 측정하여 본 결과 $1000^{\circ}C$, Ar/H=8:2의 분위기에서 8h 이상 처리된 C12A7:H의 경우 상온(300 K)에서 $10^2{\Omega}{\cdot}cm$의 비저항 값을 나타내었다. The $12CaO{\cdot}7Al_2O_3$(C12A7) powders were successfully synthesized using combustion method with microwave-assistant and C12A7:H were fabricated by post-annealed process in Ar/H atmosphere. X-ray diffraction patterns and TGDSC were used for investigating to the precursors of crystalline and reaction depending on temperature. C12A7:H that was treated post-annealed process were investigated TG-MS and Hall-measurement for confirming H ions doping and checking electrical resistivity of C12A7:H. H ion substituted to $O^{2-}$ ions in the C12A7 cages were confirmed at $289.5^{\circ}C$ by TG-MS and C12A7:H calcined at $1000^{\circ}C$ in Ar/H=8:2 atmosphere for 8~10 h has low electrical resistivity about $10^2{\Omega}{\cdot}cm$ at room temperature.
APCVD법으로 증착한 3C-SiC 박막의 라만 산란 특성
정준호,정귀상,Jeong, Jun-Ho,Chung, Gwiy-Sang 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
This paper describes the Raman scattering characteristics of polycrystalline (poly) 3C-SiC thin films, in which they were deposited on the oxidized Si substrate by APCVD method according to growth temperature. Since the phonon modes were not measured for $0.4{\mu}m$ thick 3C-SiC, $2.0{\mu}m$ thick 3C-SiC deposited on the oxidized Si at $1180^{\circ}C$, in which TO (transverse optical mode) and LO (longitudinal optical mode) phonon modes were appeared at 794.4 and $965.7cm^{-1}$, respectively. The broad FWHM (full width half maximum) can explain that the crystallinity of 3C-SiC deposited at $1180^{\circ}C$ becomes polycrystalline instead of disorder crystal. Additionally, the ratio of intensity $I_{LO}/I_{TO}{\approx}1.0$ of 3C-SiC indicates that the crystal disorder of $3C-SiC/SiO_2/Si$ is small. Compared poly $3C-SiC/SiO_2$ with $SiO_2/Si$ interfaces, $1122.6cm^{-1}$ phonon mode was measured which may belong to C-O bonding and two phonon modes, 1355.8 and $1596.8cm^{-1}$ related to D and G bands of C-C bonding in the Raman range of 200 to $2000cm^{-1}$.
Yb<sup>3+</sup>와 Er<sup>3+</sup> 이온이 동시 도핑 된 SrMoO<sub>4</sub>에서 발생되는 업컨버젼 현상에 대한 분석
정준호,허태형,이정훈,이상엽,강석현,김소연,김새암,최봉근,심광보,Chung, Jun Ho,Heo, Tae Hyung,Lee, Jeong Hoon,Lee, Sang Yeop,Kang, Suk Hyun,Kim, So Yeon,Kim, Sae Am,Choi, Bong Geun,Shim, Kwang Bo 한국결정성장학회 2012 韓國結晶成長學會誌 Vol.22 No.5
본 연구에서는 complex citrate-gel method를 이용하여 $Yb3^{3+}$, $Er^{3+}$ 이온이 동시 도핑 된 $SrMoO_4$($SrMoO_4$: $Yb^{3+}/Er^{3+}$)를 성공적으로 합성하였으며, 그 구조적, 광학적 특성을 분석하였다. 980 nm의 근적외선 여기 광 하에서 상기 분말은 530 및 550 nm 부근의 강한 녹색 방출과 670 nm 부근에서의 약한 적색 방출은 $Er^{3+}$ 이온 내의 intra 4f transition $Er^{3+}$($^4F_{9/2}$, $^2H_{11/2}$, $^4S_{3/2}$) ${\rightarrow}$ $Er^{3+}(^4I_{15/2})$에 의한 현상임을 확인하였다. 또한, $Er^{3+}$ 및 $Yb^{3+}$ 이온의 최적 도핑 농도는 각각 2/16 mol%로 조사되었으며 그에 따른 형성 가능한 upconversion 메커니즘에 대하여 논의하였다. $Yb^{3+}$, $Er^{3+}$ co-doped $SrMoO_4$ ($SrMoO_4$ : $Yb^{3+}/Er^{3+}$) specimens have been successfully synthesized via the complex citrate-gel method and their structural and optical properties were investigated in detail. Under 980 nm excitation, $SrMoO_4$ : $Yb^{3+}/Er^{3+}$ UC phosphors have been emitted strong green luminescence at 530 and 550 nm with weak red emission around 670 nm corresponding to the intra 4f transitions of $Er^{3+}$ ($^4F_{9/2}$, $^2H_{11/2}$, $^4S_{3/2}$) ${\rightarrow}$ $Er^{3+}$ ($^4I_{15/2}$). The optimal doping concentrations of $Er^{3+}$ and $Yb^{3+}$ ions were verified to 2/16 mol% and a possible upconversion mechanism depending on pump power dependence is studied in detail.
정준호(Chung, Jun-Ho),권승구(Kwon, Sung-Ku) 동국대학교 사회과학연구원 2011 사회과학연구 Vol.18 No.1
이 연구는 국제 곡물시장의 수급 및 가격 현황을 살펴본 후 불안정한 국제곡물 시장의 원인을 분석하기 위해 실시되었다. 또한 이러한 불안정성이 국내 및 세계 시장에 미치는 영향을 파악하고 안정적 곡물 조달을 위한 대응방향을 도출하고자 하였다. 2006년부터 2008년까지 국제 곡물가격은 1973년 세계 식량위기 이후 가장 큰 폭으로 증가하였다. 이는 단기적인 공급부족뿐만 아니라 다양한 요인들에 의한 장기적인 수급불균형 문제가 영향을 미친 것으로 판단된다. 또한 이러한 국제 곡물가격 급등현상으로 인하여 최빈국을 중심으로한 개발도상국들에게는 식량부족으로 인한 폭동 등을 발생시켰으며, 국내에도 축산농가의 수익성 악화나 식품 물가 상승 등의 악영향을 미쳤다. 따라서 향후 불안정한 국제 곡물시장에 대비하기 위하여 곡물의 안정적 공급을 위한 구체적 방안들이 마련되어야 할 것으로 보인다. 특히, 중장기적 관점에서 곡물 자급도 향상은 반드시 필요하다. 곡물자급도 향상은 국내 수요를 충족시키기 위한 양적인 확대가 필요할 것이며, 이와 함께 식품 안전성을 고려하여 지속 가능형 농업을 추구하는 질적 확대가 반드시 포함되어야 한다. This study aims to look into supply and demand as well as price fluctuation in the global grain market and to analyze the cause of unstable market. This study also investigates how an increase in global grain prices affects domestic and foreign market conditions, and then gives a solution for South Korea to secure enough grains stably. Between 2006 and 2008, global grain prices soared by the largest amount since the global food crisis in 1973. These sudden increases resulted from not only temporary lack of supply, but also long-term imbalance between supply and demand in the global grain market and the inflow of speculative money. A dramatic increase in global grain prices led to developing countries suffering from food crisis, worse profitability of stock raising farmers, and a price increase in processed food. Political demonstrations spread across many developing countries, and casualties occurred in some of them. This threat of food security also scared South Korea as well as other developing countries. Therefore, detailed solutions for secure grain supply should be suggested in order to prepare for the unstable global grain market. To deal with the unsecure grain supply problem effectively in middle-long term, it is essential to enhance the grain self-sufficiency. Expanding self-sufficiency in food production will bring the improved ability to meet domestic grain demand. Lastly, in terms of providing the safe food, this study should include the considerations of sustainable agriculture as well to improve the food safety in South Korea.
애니메이션이란 무엇인가? - 애니메이션의 매체적 특성과 정의에 관한 연구
정준호 ( Chung Jun Ho ) 한국디지털영상학회 2017 디지털영상학술지 Vol.14 No.-
What is animation? This study is done as a process for answering the question. Until now, animation has been studied as a means of industry, media characteristics, aesthetics, and education, but no research has been done on what animation is. It is because we are mistaken that we already know the definition of animation and we know what animation is through the well-known definition of animation. However, these unverified definitions of animation have obscured the true identity of the animation and hindered the development of the animation. This study theme seems slightly provocative but I suggest the answer about what animation is. Animation is making artificial movement on virtual space using still images. This suggested definition of animation should be revised and refuted in the future. But through this process, we can realize the essence of the art medium of animation and set a milestone for what orientation we should have.
방신영,김우식,정준호,최봉근,심광보,Bang, Sin-Young,Kim, Woo-Sik,Chung, Jun-Ho,Choi, Bong-Geun,Shim, Kwang-Bo 한국결정성장학회 2008 한국결정성장학회지 Vol.18 No.2
열증착법(thermal evaporation method)에 의해 ZnO 나노선을 합성하였다. 나노선 합성조건에 따른 구조적 특성을 분석하여 그 합성 메카니즘을 확인하였다. ZnO 나노선 합성 시 기화 온도가 고온일수록 성장속도가 빠르고 $CO/CO_2$ 분압이 역전되는 1000$^{\circ}C$ 이상에서는 그 형태가 크게 변화하고, 성장온도 700$^{\circ}C$ 이상에서 Au 촉매가 그 기능을 하고 있음을 확인하였다. 성장된 ZnO 나노선은 380 nm에서의 blue emission을 나타냄을 확인하였다. ZnO nanowires were synthesized by the thermal evaporation method and their growth mechanisms were confirmed by the characterization of the structural features depending on the growth conditions. The increase of vaporization temperature accelerates the growth rate and morphologies of ZnO nanowires were drastically changed at the temperature over 1000$^{\circ}C$, because of changed $CO/CO_2$ partial pressure. Au particles play their role on growth of ZnO nanowire as catalyst at growth temperature over 700$^{\circ}C$. The synthesized ZnO nanowires exhibit blue emission at 380 nm.
리튬용융염계 산화성분위기에서 Al-Y 코팅한 Haynes 263의 고온 부식거동
조수행,임종호,정준호,서중석,박성원,Cho Soo-Hang,Lim Jong-Ho,Chung Jun-Ho,Seo Chung-Seok,Park Seoung-Won 한국재료학회 2005 한국재료학회지 Vol.15 No.3
The electrolytic reduction of spent oxide fuel involves the liberation of oxygen in a molten LiCl electrolyte, which results in a chemically aggressive environment that is very corrosive fir typical structural materials. So, it is essential to choose the optimum material f3r the process equipment handling molten salt. In this study, the corrosion behavior of Al-Y coated Haynes 263 in a molten salt of $LiCl-Li_2O$ under oxidation atmosphere was investigated at $650^{\circ}C$ for $72\~168$ hours. The corrosion rate of Al-Y coated Haynes 263 was low while that of bare Haynes 263 was high in a molten salt of $LiCl-Li_2O$. Al-Y coated Haynes 263 improved the corrosion resistance better than bare Haynes 263 alloy. An Al oxide layer acts as a protective film which Prohibits Penetration of oxygen. Corrosion Products were formed $Li(Ni,Co)O_2$ and $LiTiO_2$ on bare Haynes 263, but $LiAlO_2,\;Li_5Fe_5O_8\;and\;LiTiO_2$ on Al-Y coated Haynes 263.